Fix screen reader announcing only button name, not associated description in WPF Gallery

Fold the card Description into AutomationProperties.Name for HeaderTile (5 home tiles) and NavigationCardTemplate (overview/category cards) so Narrator announces both the title and its associated descriptive text. Addresses AzDO 3019241.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mmanolova-msft

Sample Applications/WPFGallery/Controls/HeaderTile.xaml

@@ -14,9 +14,14 @@
         VerticalAlignment="Stretch"
         HorizontalContentAlignment="Stretch"
         VerticalContentAlignment="Stretch"
-        AutomationProperties.Name="{Binding Title, RelativeSource={RelativeSource AncestorType=local:HeaderTile}}"
         Click="RootButton_Click"
         Padding="24">
+        <AutomationProperties.Name>
+            <MultiBinding StringFormat="{}{0}. {1}">
+                <Binding Path="Title" RelativeSource="{RelativeSource AncestorType=local:HeaderTile}" />
+                <Binding Path="Description" RelativeSource="{RelativeSource AncestorType=local:HeaderTile}" />
+            </MultiBinding>
+        </AutomationProperties.Name>
         <Button.Resources>
             <SolidColorBrush x:Key="ButtonBackground" Color="{DynamicResource AcrylicBackgroundFillColorDefault}" Opacity="0.8" />
             <SolidColorBrush x:Key="ButtonBackgroundPointerOver" Color="{DynamicResource AcrylicBackgroundFillColorDefault}" Opacity="0.9" />

Sample Applications/WPFGallery/Resources/Templates.xaml

@@ -16,9 +16,14 @@
             Margin="7"
             Padding="20,10"
             HorizontalContentAlignment="Left"
-            AutomationProperties.Name="{Binding Title, StringFormat='{}{0}Page'}"
             Command="{Binding ViewModel.NavigateCommand, RelativeSource={RelativeSource AncestorType={x:Type Page}}}"
             CommandParameter="{Binding PageType}">
+            <AutomationProperties.Name>
+                <MultiBinding StringFormat="{}{0}Page. {1}">
+                    <Binding Path="Title" />
+                    <Binding Path="Description" />
+                </MultiBinding>
+            </AutomationProperties.Name>
             <StackPanel Orientation="Horizontal">
                 <Image Source="{Binding ImageSource}"
                         Width="50"